nt from the other rocks, too," said John. "I wonder what
made it black this way."

"Do you notice," remarked George, "that it doesn't look so much like a
shark when you are close to it? When we first saw it, it certainly did
though."

"Didn't it? Let's go back to that spot again."

They retraced their steps and once more viewed the odd shaped rock from
the place where they had first caught sight of it. More than ever were
they impressed by its weird resemblance to a giant shark.

"We'll certainly have to tell Grant and Fred about this," said John.
"We'll bring them down here to look at it too."

The two friends resumed their walk along the shore and before many
moments had passed they caught sight of Fred and Grant.

"What do you think they're looking at?" exclaimed George.

"I don't know, Pop," returned John. "They certainly seem interested in
something though, don't they?"

Fred and Grant were lying face downward on a rock which overhung the
water. Their gaze and attention seemed riveted on what they saw below
them, so that they did not even hear their friends approach.

"What are you two looking at?" demanded George curiously.

Grant looked up at the sound of his comrade's voice but he did not
answer. He merely beckoned with one finger and then pointed to the water
below. John and George were not long in taking their places alongside
the other two and soon they were just as engrossed in what they saw as
were their companions.

The water was deep right up to the shore. It was also as clear as
crystal so that everything in it could be seen with remarkable
distinctness. Sand was mixed with coral on the bottom and the water was
populated with fish, and such strange fish too. All sizes, shapes and
colors they were; some almost flat with strange little pig-like mouths;
others chunky and with flat backs as though some one had hammered them
out. All of them, however, were wonderfully provided with marvelous
coloring, some of them with shades that changed from time to time. A
brilliant green ray, shaped like an eel, lay coiled about a piece of
coral; he opened his mouth with its wicked looking teeth and sucked in
the water which he could be seen to expel a moment later from his gills.

For a long time the four boys lay and watched these things in silence.
It was like a fairy story to see all these strange inhabitants of the
tropic seas.

"Whew," sighed Fred at length, "that's a wonderful sight."

"I should sa